Maths Crossword on quadrilaterals

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Across
  1. 5. a quadrilateral which has adjacent sides equal
  2. 6. polygon with 1 or more interior angles
  3. 8. a figure of parallel sides and opposite sides equal
Down
  1. 1. a closed shape with strait lines
  2. 2. a quadrilateral with a pair of parallel sides
  3. 3. a regular polygon of all sides equal
  4. 4. polygon which has equal sides and angles
  5. 6. polygon with all interior angles less than 180
  6. 7. a line segment connecting opposite sides of a polygon